Spark plug



R. SUNDBERG Aug. 14, 1923.

SPARK PLUG Filed Aug. 20. 1921 INVENTOR ATTORNEY PatentedAug; l4, 1923. I

,UNITED]. STATES PATENT OFFICE.

BICHELIEU SUNDIBERG, OF SALT LAKE CITY, UTAH.

. SPAR-K PLUG.

To all whom it may concern:

Be it known that I, RICHELIEU SUNDBERQ, a citizen of the United States, residin at Salt Lake City, in the county of Salt ake and State of Utah, have invented certain new and useful Improvements in Spark Plugs, of which the following is a specification. r I

My invention relates to spark plugs used on internal combustion engmesand hasfor its objectto provide a spark lug which .will allow air to enter the cylin er nnmediatelyaround and contiguous the sparkgapin order to make a bettercombustion of the gas and thereby prevent any accumulation.

of carbon on'the electrode and on the insulator. A further object is to provide a spark plug having a movable electrode and which also forms the stem of a valve that in turn controls the air which I introduce as above mentioned. And a still further object of my invention isto provide an electrode which will carry any excess oil away from the spark gap.

These objects I accomplish with the device illustrated in the accompanying draw--- I ,spark plugs is caused b a lack of oxygen in a the combustion chamber 0 the gas and particular y at the spark and the resent invention overcomes suc difliculty y providing means to introduce air around the spark gap, the loxygen content thereof combining with the gas and aiding combustion at that particular point in the 'en ine. The

? mventionconsists of a metal shel or casing A externallythreaded, as at 1, to be screwed into the combustion chamber of the engine,

' and the co-operating sleeve nut B which is used as a jam nut to fasten a porcelain plug- C within said shell A. The said orcelain lug C is provided with a centra bore or liole 2, a portion of which is internally threaded, as at 3. A sleeve 'nut- D is externally threaded to mesh with the said threads spiral spring 8. The u when the engine A ucaaon m August 20, 1am. Serial No. 493,954.

3 and is screwed into the upperportion of said porcelain plug C, aportion of said nut D is extended as a cap or covering for said plug C, as shown at 4, and a packmg washer 5 is carried on said sleeve'nut D between the extended portion of said nut D and the porcelain. The upper end of said porcelain plug. (1- is given a coniical shape and likewise said washer 5 and the extended portion 4 of said sleeve nut D.

The upper end portion of said sleeve nut D is given a globular shape 6 to form a ter- 1 inal post for the current carrying wire, and the interior of said terminal post 6 is bored out to form a spring chamber and priming cup 7 ,-within which is carried the cup'is outwardly flange as at!) to be engaged by the dust cap 10. The lower edge of said dust cap is slotted as at 17 to allow air to pass through, and also givin a sprin effect to the slotted of said sleeve .nut is-chamfered out to form a valve seat 11, within which a valve 12 seats. Within the said central bore of said sleevenut D is loosely carried the valve per edge of said ortion. The ower end i stem. E on which said valve .12 is secured,

and which stem is spaced from the inner wall of said sleeve nut D, A nut 13 is screwed on the 'upper end portion of said stem and said nut bears against said s ring 8'. The tension ot-which spring is such as to practically carry the weight of said stem and its connections, in order, that said valve will be seated easily by the compression ac-' tionof the engine plston and unseate'd by the suction of the engine piston. Immediately beneath the said valve 12 the said valve stem fisjmade larger as'at 14 to provide a shoulder thereon for carrying vmore firmly 'the said valve 12.-- ,On the lower end of saidvalve stem'E ,is secured the conically shaped deflector 15 to direct the flow of any oil which may enter-said park plug-to the periphery edge of said deflector and away from the spark gap. v An electrode wire 16 is fastened at each end in the lower end of said casing A Y and the said wire is passed diametrically -be' low and across the opening of said deflector, and with its medial portions bent or curved upwardly to contact withsaid deflector'15 moved downward y The operation of my invention is as vfollows :-With the en he in operation and electric energy supp edcause a spark piston is sucking or being I on the compression stroke of the piston the valve 12 will be seated and the gas will be compressed as usual with more than the usual amount of air immediately surrounding the gap between the electrodes. The gap is produced by the valve 12 seating and moving the stem E and deflector 15 away from the electrode 16. The length of travel of the valve stem E is regulated by means of the nut 13 when turned on the stem E. If my spark plug is to be used in cylinders whichdeposit an excess of carbon on the electrode, by loosening the nut 13 on the stem E the deflector 15 will strike the electrode 16 and remove the carbon and polish the electrode and thereby give a hotter spark. If at any time it is found desirable to introduce gasoline for priming the cylinders it is easily done by pouring gasoline into the priming 'cup 7, and any cylinder cleaning liquid may be introduced into the cylinder in the same manner. Should more lubricating oil be used than is required in the cylinder any excess oil will be deflected away from the spark gap bythe deflector tionof carbon on the electrodes and on the insulator, and keeping the spark plug clean. and cooling the i porcelain insulator thereof. Also the air entering the plug is forced against the wall of the insulator at its lower end and by passing it over the periphery of valve 12 and thereby keeping the insulator perfectly clean and assuring more perfect insulation.

Having thus described my invention and its operation I desire to secure by Letters Patent and claim A spark plug comprising two metal shells screwed together to hold an insulator; an insulator having a central bore longitudinally therein and with internal threads therein to receive a sleeve nut; a sleeve nut screwed in said bore and having a valve seat on its lower end; a hollow terminal post formed on the outer end of said sleeve nut; a valve stem spaced from and carried in said sleeve nut; a spiral spring carried on said stem and within the hollow of said terminal post to seat a valve; and a valve formed on said stem adapted to seat in the lower end of said sleeve nut.

In testimony whereof I have affixed my Signature.

RICHELIEU SUNDBERG. 

